/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the License at the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apereo.portal.i18n;

import java.text.MessageFormat;
import java.util.Locale;
import org.apereo.portal.i18n.dao.IMessageDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.MessageSource;
import org.springframework.context.support.AbstractMessageSource;

/**
 * DB based {@link MessageSource}. This is used for enabling i18n on database entities that does not
 * support it directly. This message source is more convinient for tranlation of such entities
 * because of the same dynamic nature - tab titles, group names, and other entities can be changed
 * very frequently, hence it does not make sense to edit message files to follow these changes
 * (althought they are reloaded on regular basis).
 *
 * <p>Note that this message source should be used in conjunction with file-based message sources,
 * who provide translations for messages in other files (like XSL). It can be achieved by setting
 * this message source as parent to resource bundle message source, thus primary source would be
 * resource bundle, but if message could not be found there, this implementation would be used to
 * look up for a message. Of course, it can be set up the other way round - if resource bundle
 * message source will be set as parent to this message source, then this message source will become
 * the primary one.
 */
public class DatabaseMessageSource extends AbstractMessageSource implements MessageSource {

    private IMessageDao messageDao;

    @Autowired
    public void setMessageDao(IMessageDao messageDao) {
        this.messageDao = messageDao;
    }

    @Override
    protected MessageFormat resolveCode(String code, Locale locale) {
        if (locale == null) {
            return null;
        }

        Message message = messageDao.getMessage(code, locale);
        return message != null ? new MessageFormat(message.getValue(), locale) : null;
    }

    @Override
    protected String resolveCodeWithoutArguments(String code, Locale locale) {
        if (locale == null) {
            return null;
        }

        Message message = messageDao.getMessage(code, locale);
        return message != null ? message.getValue() : null;
    }
}
